Artificial tooth.



T. F. GLENN.

ARTIFICIAL TOOTH.

APPLICATION FILED M022, 1916.

v Patented May 28,1918.

1:: a NT Erna THOMAS E. GLENN, 0E mam/roan, PENNSYLVA IA, ASSIGNOR To THE s. s. WHITE DENTAL MANUFACTURING COMPANY, A CORPORATION or PENNSYLVANIA.

ARTIFICIAL TooTH.

Specification of Letters Patent.

Patented May 28, 1918.

Application filed December 22, 1916. Serial No. 138,398.

To all whom it may concern:

Be it known that I, THOMAS F. GLENN, a citizen of the United States, anda resident of Ardmore, in the county of Montgomery, State of Pennsylvania, have invented certain new and useful Improvements in Artificial Teeth, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates particularly to that class of artificial teeth that are commonly known as vulcanite teeth, and that are adapted to be mounted on a plate of vulcanite or othersuitable material, which may be retained in the mouth of the wearer by suction or adhesion, and is especially directed to the form of teeth generally known as diatoric or pinless teeth.

The principalobjects of my invention are, to provide an artificial tooth which is esthetic in appearance, closely simulating the characteristics of natural teeth, and which combines strength and simplicity, with a consequent economy. of manufacture.

Other objects of my invention are, to provide an artificial tooth having retaining anchorages of such form as to adequately withstand, when mounted, any of the strains incident to the normal use of natural teeth, and alfording easy access for the entrance of the mounting material to said anchorages.

Specifically stated, the form of my invention as hereinafter described comprises an artificial tooth having a recess in its lingual face extending toward the incisal end of the tooth, and forming a transverse undercut retaining abutment or shoulder connecting the lateral walls of said recess, which are not undercut and which afford webs of maximum strength, and between which said tooth is provided with an undercut counter recess.

My invention also includes all of the various novel features of construction and arrangement hereinafter more-definitely specilied.

In the accompanying drawings, Figure 1 is a rear elevational view of a tooth conveniently embodying my invention; Fig. 2 is a central vertical longitudinal sectional view of said tooth, taken on the line 22 in Fig. 1; and Fig. 3 is a transverse sectional view of the tooth shown in Figs. 1 and 2, taken on the line 33 in Fig. 2.

In said figures, the tooth body 1, whose lingual Wall comprises the ridge-lap 2, shut 3, and bite 1, is provided with the recess 5, the labial wallG of which preferably slopes labially toward the incisive edge 7 of said tooth, but may be parallel with the shut 3, or otherwise disposed if desired. 1

Within the recess 5 the tooth may be preferably provided with a counter recess 9 disposed in the labial wall 6 and extending labially into the tooth body, forming the undercut cavity 8, and serving to prevent the longitudinal and labial displacement of the tooth with respect to its mounting.

Said undercut counter recess 9 is disposed in spaced relation to the lateral walls 10 and 11 and the incisive wall 12, the former of which are preferably disposed substantially parallel with the axis of said undercut recess, while the wall 12, laterally referred to, is undercut and labially extends toward the incisive end of the tooth to form the transverse pocket 18, which provides the'retaining shoulder 15 in opposition to the natural strains incident to the act of mastication.

It will be observed that a tooth constructed in accordance with my invention provides strengthening webs 16 and 17 at the.

respectively opposite sides of the tooth body, which embrace the recessed region, and as the opposed walls 10 and 11 of said webs are not undercut, they not only provide ample reinforcements for said tooth body at the region where it is most likely to fracture, but afford an unobstructed entrance into the recess formed thereby, for the convenient packing of the rubber or other mounting material, which is highly esential, and espe cially so in extremely narrow teeth, wherein the transverse dimension of the space or recess is necessarily limited.

Furthermore, a tooth constructed in accordance with my invention may be readily packed with the rubber or other mounting material, for vulcanization, for, as will be obvious, after the counter recess 9 has been packed, the recess 5 may be packed by tamping the rubber toward the incisively disposed pocket 13, for as the lateral walls are not undercut, it is unnecessary to tamp the rubber toward the sides of the recess; thus it will be seen that the packing operation is greatly facilitated.

It may be further noted that a tooth c0nstructed in accordance with my invention greatly facilitates its Withdrawal from the tooth forming mold, for, as best shown in Fig. l, the lateral Walls 10 and 11 of the recess 5 slightly diverge gingiva'lly, and, as best shovv'nin Fig. 2, said recess is so formed as to offer substantially no resistance to the Withdrawal from said mold.

My invention is advantageous in that it Wholly-eliminates the anchorage pins, which are usually formed of precious metal, such as platinum, whereby the cost of manufacture is materially Zreduced. I

do not :desire to limit my invention to the precise details of construction and arrangement as herein set forth, as it is obvious ithat various modifications may be made therein Without departing from the essential features of my invention as defined 'by the appended claims.

Having thus described my invention, I claim:

1. A tooth having in its lingual face, a recess WllOSB la'teral walls are disposed substantially normal to said lingual face, the incisively disposed Wall being undercut to form atransversely directed pocket, and the ilabially disposed Wall comprising an undercut cavity extending labially.

2. A tooth :having inits lingual face a recess forming an undercut shoulder, and having an undercutcavity in the labial wall of said recess, spaced from said shoulder.

In Witness whereof Ihave hereunto 'set my hand this 20th day of December, A. D. 1916.

THOMAS F. GDENN.

- Vitnesses R. L. VAILL, R. H. MEAG.

Copies-of this patentmay be obtained for -fivecei1ts each, by addressing the Commissioner of Patents,

' Washington, I). G. 

